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https://issues.apache.org/jira/browse/QPID-8717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tomas Vavricka resolved QPID-8717.
----------------------------------
Resolution: Fixed
> [Broker-J] Broker query engine may produce ClassCastException when using AVG
> function
> -------------------------------------------------------------------------------------
>
> Key: QPID-8717
> URL: https://issues.apache.org/jira/browse/QPID-8717
> Project: Qpid
> Issue Type: Bug
> Components: Broker-J
> Affects Versions: qpid-java-broker-10.0.0
> Reporter: Daniil Kirilyuk
> Priority: Minor
> Fix For: qpid-java-broker-10.0.1
>
> Attachments: ClassCastException.txt
>
>
> REST API request using AVG aggregate function sometimes returns http 500
> server error to client and broker.log records ClassCastException.
> {code:java}
> curl -i -X POST -H "Content-Type: application/json" -H "Accept:
> application/json" -d \
> '{
> "sql": "SELECT AVG(queueDepthMessages) AS AverageDepth FROM queue"
> }' \
> http://localhost:8080/api/latest/querybroker/broker {code}
> Error stacktrace: [^ClassCastException.txt]
> *Analysis*
> The issue appears when an avg value is calculated on queues having same depth
> and therefore returning an integer average value instead of double, e.g. when
> all queues have zero depth.
> *Implementation*
> The change ensures that the result of the narrowing operation is explicitly
> converted to double before returning, rather than returning a generic Number.
> This improves type safety and guarantees the method always returns a Double
> as intended.
>
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